Makes sense, but (#{:a :b :c} :b) doesn't return 'true', it
returns :b. So it's not really acting like an object to boolean
mapping. Doesn't much matter, though.
By the way, I'd like to see map-map in the core.
-Ethan
On Jan 12, 5:30 pm, Stuart Sierra <the.stuart.sie...@gmail.com> wrote:
> A set is, in a sense, a function mapping from arbitrary objects to
> Boolean values. If the object is in the set, it returns true. A list,
> in the Lisp world at least, only has two elements, first and rest (car
> and cdr in older Lisps). A list object isn't really a "complete"
> collection the way vectors and maps are. There isn't a good way to
> conceptualize that as a function.
>
> I've probably just made this more confusing, but that's the best I
> could come up with.
>
> -Stuart Sierra
>
> On Jan 12, 6:51 pm, Ethan Herdrick <herdr...@gmail.com> wrote:
>
> > Then why are sets callable? Not that I'm complaining - I found it
> > handy, then came to wonder why lists aren't.
>
> > -Ethan
>
> > > I'd just like to add to this discussion that maps and vectors are
> > > functions not just because it's neat or possible, with the
> > > implementation one of many possibilities, but because they are
> > > associative, and associative collections are inherently functions of
> > > their keys/indices.
>
> > > Lists/seqs are not associative, thus not functions.
>
> > > Rich
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To post to this group, send email to clojure@googlegroups.com
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
-~----------~----~----~----~------~----~------~--~---
